| 摘要 |
PURPOSE:To produce a high manganese steel having excellent resistance to cracking, by adjusting the content of P and controlling secondary cooling in the stage of continuous casting. CONSTITUTION:The content of P in a high manganese steel contg., by weight %, 0.9-1.20% C and 11.0-14.0% Mn is made at <=0.030. The molten steel is cast continuously in a 0.7-1.1l/kg range in the secondary cooling water ratio expressed by the equation and after the cast billet is heated at a rate ranging 30-35 deg.C/h, the billet is held at 1,180-1,230 deg.C for >=3hr. Thereafter, the billet is subjected to preliminary rolling and the rolled slab is heated to >=850 deg.C and is subjected to a water toughening treatment. |
